Hello everyone, just joined this site after lurking a couple of days.... I am a 40 year old geezer who was into Dirt bikes back in the late 1970's and early 80's, but stopped riding soon after those years, (street bikes, girls etc. came along) Anyway after prodding by a co-worker who bought a 2003 Yzf 450, I got a great deal on a 2004 Yzf 450 with about 50 hours or so on it, never raced only trail ridden. This bike is definately not your Father's Dirt Bike!! What a torque monster compared to the old YZ two strokes I rode years ago. The bike runs beautifully from idle to full out, and I rode it the first time last Tuesday for about 4.5 hours and again today for about two hours. Some observations: The bike is tall and narrow, and top heavy, but to me it seems to ride much more stable at higher speeds than at creeping along (trail riding). I felt much more comfortable moving with some speed than I did twisting around the tight areas. My first day of riding was at Tower City in Pennsylvania, with some friends on top of what is basically Mountains of Coal with trails that were heavily laced with embedded rock and loose rock. The bike was great on the trails, but when I tried the tighter turns on top of the Coal areas, the front tire would not bite in and seemed to "push-out" or slide out and dumped me twice at about 8 miles per hour or so. My tires are the stock Dunlop models, with about 1/2 inch center height tread on the rear, and about 3/8 inch tread left on the front. My buddy was riding his 2003 model with the Kenda Millville's, and he seemed to grip a lot better. I realize these tires are worn somewhat, but shouldn't they be doing better?? Also today I went riding with some ATV guys through woods and along power line valleys, and the rear tire on the hills was loosing traction if I didn't keep speed up (I was running at about 13 p.s.i. rear) the ground was compacted dirt/grass with an occasional rock here and there. If I stalled out on the hill, it was tough to keep from spinning even when feathering the Clutch. Is this tire just too hard/worn?? any recommendations would be appreciated....... Don Oh, by the way the bike is fully stock.